Control device

Abstract

A control device capable of selectively controlling either one of two controlled members with the use of one control means. The control device incorporates a link and a lock member. The pivot structure of an arm between the link and the control means is improved, thereby to provide a smooth swing of the link.

I claim: 
     
       1. A control device comprising a control arm, one end of said control arm being pivoted about a fixed support shaft,   a control means including a rod pivotably secured at one end thereof to the opposite end of said control arm,   a first pin secured to said control arm at a mid-point linearly of said control arm and extending perpendicular thereto,   a swing link positioned above said control arm and pivotably secured on said first pin at the midsection of said swing link,   first and second control members spaced from each other and secured parallel with each other,   said first control member pivotably connected at one end thereof to one end of said swing link and pivotably connected at its other end to a first hydraulic control valve for operation thereof,   said second control member pivotably connected at one end thereof to the opposite end of said swing link a distance from said first pin equal to said pivotable connection of said first control member and pivotably connected at its other end to a second hydraulic valve for operation thereof,   a lock member positioned between said first and second control members and adapted to selectively lock one of said first and second control members in a fixed position while permitting parallel movement of the non-locked control member,   said swing link being positioned parallel with said control arm with their linear axis in the same vertical plane when said first and second control members and said control means are in their neutral position,   whereby a central axis of said rod, said swing link and a central axis of said first and second control members are located substantially on a single plane.